In QPSK modulation, the bit stream of the signal ... The classical circuitry to implement s(t) is based on the block diagram shown in Figure 1. If I and Q take their values from the set \[1 ...

We proceeded to create our SDR system, with the main goal of the project to transmit over the analogue audio channel with QPSK modulation. The block diagram of the system is shown in figure 3. The ...

In this they studied the scatter plot, eye diagram and signal trajectory of QPSK system over different communication channels. All modulation techniques have different performance characteristics ...